This PR fixes a warning I observed when running `cargo doc` against the
`zed` crate:
```
Documenting zed v0.141.0 (/Users/maxdeviant/projects/zed/crates/zed)
warning: this URL is not a hyperlink
--> crates/zed/src/main.rs:860:69
|
860 | /// URLs can either be file:// or zed:// scheme, or relative to https://zed.dev.
| ^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<https://zed.dev.>`
|
= note: bare URLs are not automatically turned into clickable links
= note: `#[warn(rustdoc::bare_urls)]` on by default
```
Release Notes:
- N/A